caller ID feature on I phone XMAX

Caller ID is a carrier feature. Not all cellular carriers support controlling that from the device settings.

Contact your carrier for instructions on how to place a call and block your caller ID information.

It should be in settings -> phone at the bottom of the list of call features.

If your carrier is a legacy CDMA carrier (in the U.S. that's Verizon, Sprint and any resellers who use their networks), you won't have those options.